Copper alloy with improved resistance to cracking

Details Copper alloy with improved resistance to cracking Copper alloy with improved resistance to cracking

C - Chemistry, Metallurgy

22

F

C22F 1/08 (2006.01) C22C 9/02 (2006.01) C22C 9/06 (2006.01)

Patent

CA 2370170

A copper alloy having improved resistance to cracking due to localized plastic deformation and the process of making it. The alloy consists essentially of: from 0.7 to 3.5 weight percent nickel; from 0.2 to 1 weight percent silicon; from 0.05 to 1 weight percent tin; from 0.26 to 1 weight percent iron; and the balance copper and unavoidable impurities. The copper alloy has a local ductility index of greater than 0.7 and a tensile elongation exceeding 5 %. Cobalt may be substituted for iron, in whole or in part, on a 1:1 basis by weight. The alloy is precipitation hardenable and useful for electronic applications, including without limitation, connectors.

L'invention concerne un alliage de cuivre possédant une meilleure résistance à la fissuration grâce à la déformation plastique localisée et processus de sa fabrication. L'alliage comprend essentiellement entre 0,7 et 3,5 pourcent en poids de nickel et entre 0,2 et 1 pourcent en poids de fer, le reste étant du cuivre et des impuretés inévitables. L'alliage de cuivre possède un indice local de ductilité supérieur à 0,7 et une élongation à la traction supérieure à 5 %. On peut remplacer le fer par du cobalt, complètement ou partiellement, sur une base de 1 à 1 en poids. L'alliage est durcissable par précipitation et peut servir dans des applications électroniques, y compris entre autres dans des connecteurs.

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